Coated modified sodium battery positive electrode material as well as preparation method and application thereof

The invention discloses a coated modified sodium battery positive electrode material as well as a preparation method and application thereof. The coated modified sodium battery positive electrode material comprises a base material and a coating layer coating at least part of the surface of the base material, the composition of the base material is NaTiaNibCocMdO2, M is selected from one or more of Mn, Al and Mg, b is larger than or equal to 0.6 and smaller than or equal to 0.8, c is larger than or equal to 0 and smaller than or equal to 0.2, d is larger than or equal to 0 and smaller than or equal to 0.2, c and d are not 0 at the same time, a + b + c + d = 1, and the coating layer is a sodium titanium oxide compound. According to the sodium battery positive electrode material provided by the invention, the titanium element is doped in the base material to play a role in stabilizing crystal lattices, so that the cycle life of a battery is prolonged, meanwhile, the coating layer on the surface can protect the i